You've done the research. You've read the reviews. You've measured the dimensions against every major airline's carry-on policy, and you have the numbers memorised. Your carry-on luggage is hard shell, lightweight, and spins on four wheels with the kind of smooth, silent precision that makes everyone in the terminal quietly jealous.
You pack exactly what you need - no more, no less - using a colour-coded packing list that you've refined over years of travel. You arrive at the gate with time to spare, and you've already mentally mapped which overhead locker you're heading for the moment you board.
Compression cubes are your love language. You've never checked a bag in your life, and you never will.